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An Integrative Guide to Sacroiliac Joint Dysfunction: UnderstandingYourLowBackandButtockPain By,DavidMesnick,PT,OCS,cMDT ContributionsbyTravisBarefoot,DPT www.pt360atl.com Overview Themusculoskeletalsystemisanintricatenetwork ofbones,muscles,andotherconnectivetissuethat servestoprovideformandstructuretoourbodies, toproducemovement,andtoprotectourinner organs.“(Professionalsinthemedicalfield)use manualmedicinetoexaminethisorgansystemina muchbroadercontext,particularlyasanintegral andinterrelatedpartofthetotalhuman organism.”4 “SkilledPhysicalTherapistsareaninvaluablepartof ateamofhealthprofessionalsprovidingspecialknowledgeandabilitiesthatcanenablethedeliveryof aneffectiverehabilitationprocess,especiallyforpatientswithmusculoskeletaldysfunctions.”5The informationprovidedinthispamphletservestobettereducateyouasapatientontheissuescausedby thesacroiliacjoint,andhowPhysicalTherapistusecertainmethodstoexpeditetheprocessofrecovery. Anatomy Thesacroiliacjoint,abbreviatedas“SI”joint,isa connectionoftwobonesjustbelowthelumbar vertebrae(yourlowerback).Thisjointiscomposed ofthesacrumandiliumbones.Justasthekeystone inamasonryarchservestomaintainthestructural integrityofdoorwaysandceilings,thesacrumisa biologicalequivalenttothestructuralintegrityof thepelvis. Thereare2partstotheSIjoint;oneithersideofthesacrumwehave2iliums(placeyourhandsonyour ‘hips’andyou’refeelingthetopoftheilium)andbetweentheplacementsofyourhandsbeingonyour hipslaysthesacrum.Thisisthe“SIjoint”.Previousschoolofthoughtbelievedthisjointtoberelatively ‘fixed’,orextremelystable.However,moreup-to-dateresearchoutlineshowthemobilityand synchronicityofmovementatthisjointplaysanextremelyimportantroleinthenormalmotionofthe humanbody. Normalmovementofthesacruminrelationtotheiliumisdescribedas‘nutation’(andconversely, ‘counternutation’),whichcanbedefinedasoscillatorymovementoftheaxisofarotatingbody1. Anotherwaytothinkofthisistoimaginethetopofthesacrummovingforwardanddowncomparedto thebottom,andthentheoppositewouldthenbecounternutation.Thesemotionsoccurinconjunction withothermovementslikewalking,bendingforward/backward,andevenbreathing! Signsandsymptoms WhenthereisadisturbanceinthenormalmovementoftheSIjoint,an arrayofsignsandsymptomsmaybepresent.InaPhysicalTherapy examination,thetherapistwillobservethemotionoftheSIjointand otherinvolvedstructuresviaspecialteststhatareoutlinedinthis handout.Althoughspecialtestsarepresenttoserveasabasisfor examination,realizethateveryevaluationmayvaryfromtherapistto therapist.“PeoplewithSIjointdysfunctionwillhavesymptomsranging frompainatthejointitself,inthelowerback,orevendownthethigh andgroin.Theremaybeapresenceofgeneralizedstiffnessorburning sensationatthejoint”2.SometimesanSIdysfunctioncanactuallycause painontheoppositesidefromwherethetrueproblemlies!3 Muscles Piriformis InnervatedbyS1andS2 WillbecomeoveractiveorfacilitatedwithanSIJD. Tendernessisusuallyfeltinthemusclebelly(deepbuttockpain)orattheorigin(sacrum)orattachment (atthegreatertrochanter) BecomestheprimarystabilizeroftheSIJinthepresenceofSIJDwhichisafaultypattern Cancompressthesciaticnerveandcancausepiriformissciatica(link)orpiriformissyndrome Overstretchingoftenincreasesoveractivityorfacilitationandleadstoincreasedpainorsciatica. Iliopsoas(iliacus+psoasmuscle) iliacus:L2-L4(femoralnerve)psoas:L1-L3(anteriorbranchesoflumbarplexus) DysfunctionatL2-3causeshypertonicityofthehipflexorgroupmuscles,whichcanmimicalabraltear Hamstrings Bicepfemoris:tibialnerve+commonperonealnerve,semitendinosus:tibialnerve,semimembranosus: tibialnerve Hamstringtearsareoftenaresultoftheinactivationofthegluteusmaximusduringathleticactivity. Overactivation/facilitationofthehamstringscanbecausedbysacraldysfunctions,T-Ljunction dysfunctions,andevenanklesprains. Neuraltensionisanadditionalsymptomoftighthamstrings.Whenneuraltensionincreases,the hamstringsbecomeshortenedtoprotectthenervesthatrundowntheleg(think:sciaticnerve). QuadratusLumborum(QL) T11-L2innervation Mostfrequentmuscularcauseofbackpain HypertonicityononesideassociatedwithFRSdysfunctionatT12-L1tothatside. PossiblytheprimarystabilizeroftheL-spine CommonwithonesidedsittersandstandersinSIJD LumbarMultifidus Innervatedbyposteriorbranchesoflumbarspinalnerves Whenthereiscompromisetothedeeplayerofthespinalcolumn(vertebrae/discs/ligaments)the multifidus,akeystabilizingmusclethatnormallyprotectstheinjuredspinaljoint,quicklyshrinksby25% andfailstoactivatecorrectly.Thismeansthekeymusclesthatnormallykeepourbacksfunctioning properlyandwithoutpaincannolongerdtheirjob.8(Jemmett) SerratusAnterior Innervation:C5-7(longthoracicnerve) BecomesinhibitedasaresultsofERS(extension)dysfunctionsintheupperthoracicspine,orfroma lossofinferior/posteriorglideoftheG-Hjoint Asaresultofthedysfunction,scapularwingingcanoccur.Thisequatestopoorscapularstabilization, cervicalpain,shoulderimpingement,anduppertrap/levatorscapulaetriggerpoints. Internal&ExternalObliques Innervation:intercostalnerves7-12,subcostalnerve Innercostalnerve8-12,iliohypogastric,ilioinguinalnerves9 Triggerpointsintheexternal/internalobliquesandtransversusabdominusallhavesimilartriggerpoint patternsintotheabdominalcavity.Referralpatternscanmimicheartburnandepigastricpain. (www.bodyworks.com) TransversusAbdominus Innervation:T8-12 Thismuscle,likethemultifidus,isakeyplayerinspinal(core)stabilizationinthelowback.Injurytothe deeplayerofthespinalcolumnresultsindecreasedcontractileabilityofthe“TrA”.Causesalsostem fromThoraco-Lumbarjunctiondysfunctionsandlowerthoracicdysfunctions. Thisleadstotight/overactivehamstrings,increasedneuraltension,andlowbackpain. Onlyneed3-5%ofTrAcontractionforstability Onlytrainaftermechanicaldysfunctioniscleared RectusAbdominus Innervation:7-12intercostalnerves Acauseofdysfunctionofthismusclegroupisaninferiorpubicdysfunctiononthesamesideasthe symptoms,whicharesamesideadductorpainandpubicpain(symphispubis). Adductors InnervationL2-L4 Arefunctionallyconnectedtotheabdominalobliqueslingofsupportfortheanteriorpelvis Whenhypertonicthepulloftheadductorscanresultinaninferiorpubicshear(symphysispubis) Diaphragm InnervationisthephrenicnerveC3-C5 Thediaphragmfunctionsinbreathing.Duringinhalation,thediaphragmcontractsandmovesinthe inferiordirection,thusenlargingthevolumeofthethoraciccavity(theexternalintercostalmusclesalso participateinthisenlargement).Thisreducesintra-thoracicpressure:Inotherwords,enlargingthe cavitycreatessuctionthatdrawsairintothelungs. GluteusMaximus InnervationL5,S1,S2 PrimaryStabilizeroftheSacroiliacjoint CanbecomeunderactivewithaLeftonRightsacraltorsionorRightonLeftSacraltorsion,and mechanicalproblematL4orL5onthesameside UnderactivityoftenresultsinchronicHamstringtightnessorinjury. GluteusMediusandMinimus InnervationL4,L5,S1 Primarystabilizerofthehipandknee BecomesunderactivewithaLeftonrightsacraltorsion,rightonleftsacraltorsion,andL4orL5 mechanicalproblemoftenontheoppositeside. UnderactivityisacommoncauseofITBsyndromeorPatellarFemoralPainSyndrome TensorFasciaLatae/Iliotibialband(TFL/ITB) InnervationofTFLisL5-S1 UnderactivityoftheGluteusMediuscausetightnessintheITB/TFLwithchronictightness. Pelvicgirdlemusclegroupsandslings The‘pelvicgirdle’simplyreferstotheenclosedstructurethatisformedfromthecollectionofbones thatmakeupthepelvis.Musclesthatattachtothepelvismakeupcomplimentarymusclegroupscalled “slings”.Thesemusclegroupsallowforeithertheproductionofmovementorstabilizationtoreduce movement.However,theseslingscansometimesbecompromisedduetostructuralmisalignmentinthe SIjoint.15 Theanteriorobliqueslingthatiscomposedoftheserratusanterior,externalandinternalobliques, rectusabdominus,transversusabdominus,andlowerlimbadductors“providesstabilitybyactinglikean abdominalbinder,compressingtheentirepelvicgirdle,especiallythefront,securingthesymphysis pubis”.6 Whentheadductorsofthelegbecomeoveractive(hypertonic),theycandistortthepositionoftheir attachmentatthepelvisandcauseaninferiorshearatthepubicsymphysis. Thelateralslingthatismadeofthegluteusmedius,andadductorsononesideofthebody,aswellas thequadratumlumborum(QL)ontheothersideprovideslateralstabilitywhenwalking.7Usually,the gluteusmediuscanbecomeunderactiveorhypotonic,resultinginabnormalpositioningofthepelvis withambulation. Theposteriorobliqueslingiscomposedofthelatissimusdorsi,thoracolumbarfascia,andgluteus maximus(onthecontralateralsidefromthelatissimusdorsi). “Theactionofthesemusclesalongwiththefascialsystemisthoughttobothfighttherotationofthe pelvisthatwouldoccurduringgaitaswellasstoreenergytocreatemoreefficientmovement.”7Muscle activityofthearmsorlegsinfluenceeachotherviatheLumbarspine Thedeeplongitudinalslingisformedfromtheerectorspinaemusclegroup,thoracolumbarfascia,and bicepfemoris(portionofthehamstring).“TheDLSusesboththethoracolumbarfasciaandparaspinal systemtocreatekineticenergyabovethepelvis,whilethebicepsfemorisactsasarelaybetweenthe pelvisandleg.Thisslinghelpstocreatestabilityandhelpbuildaswellasreleasekineticenergytohelp moreefficientmovement.”7 Types of SIJD HypermobileorLooseSIJ HistoryofTraumaorhormonalchange Waddlinggait Secondarytolumbarpathology Difficultybendingforwardandstandingononeleg(+forwardflexiontestandstorktestonthesame side) ActivestraightlegwillbeeasierwithcompressionandSIbelt/coresshortsmayhelpwithstability(link) Responsetomobilization,manipulation,taping,corestabilitywhenjointmechanicsareimproved,and prolotherapy(link)13 Excessivecompressionwithligamentouslaxity Traumaoverashortperiodoftimeorrepetitivetraumaoveralongperiodoftime Difficultybendingforwardandstandingononeleg(+forwardflexiontestandstorktestonthesame side) ActivestraightlegraisewillnotbeeasierwithcompressionandSIbeltandcoreshortswillnothelp. RespondstoMyofascialrelease,dryneedling,mobilization,manipulation,taping,corestabilitywhen jointmechanicsareimproved,andprolotherapy(link)13 HypomobileSIJ Compressedjointduetomuscleimbalance Paincanswitchsides Painisintermittent-cangoawayandreturn Oftenananteriorrotationwithleftonrightorrightonleftsacraltorsionisobserved Overactivepiriformiscausestoeoutgait(link)andpiriformissciatica(link)onthesameside. Abletostandononeleg AbletoliftbothlegswithoutcompensationwiththeActiveStraightlegtest TreatmentiscorestabilizationandMyofascialrelease/dryneedling13 TypesofhypomobileSIJD AbsentCore CanresultfromPost-partum Butt-gripper(showpic) UnderactiveTransversusabdominus(core)andpubococcygeus(anteriorpelvicfloor-andmaycause incontinencelinktopic) Overactivepiriformisbothsides,multifidusanderectorspinae(lowbackmuscles,andposteriorpelvic floor-maycausecoccydnia13 TwistedCore Theresultofaunilateral(onesided)lumbarspineorSIjointdysfunction ResultsinanAnteriorlyrotatediliumandLeftsacraltorsion UnderactiveunilateralTransversusabdominus(core),and/ormultifidusandanteriorpelvicfloor Overactiveunilateralpiriformisandposteriorpelvicfloor InvertedCore Overactivemultifidusanderectorspinaemusclesbothsides13 StiffJoint ThejointdoesnotmovesecondarytoAnkylosingspondylitis,capsularfibrosis,orjointfusionsecondary toadvancedage. Treatmentismobilizationandflexionexercises TheSIJjointhasahardendfeelwhenmobilized13 Diagnostic Testing and Physical Exam SIJointProvocationTests SIJtestingshouldbedoneonpatientswithbuttockpain,withorwithoutlumbarorLEsymptoms.Most SIJisunilateralandaroundthePSIS.Forallprovocationtests,a+testisreproductionofsymptomsand– testisnoreproductionofsymptoms. DistractionTest:Thepatientissupinetheexaminerappliespressureto“spread”theASISs. CompressionTest:Thepatientisinaside-lyingposition.Thetesterisbehindthepatientwithboth handsapplyingadownwardpressurethroughtheanteriorportionoftheilum,spreadingtheSIJ. ThighThrustTest:Thepatientissupineandthehipisflexedto90degreesandthekneeisbent.The testerthenappliesaposteriorshearingforcetotheSIJthroughthefemur.Avoidexcessivelyadducting duringthisexam. Gaenslen’sTest(Right):Thepatientissupinelyingnearthesideoftable.Theexaminerstandsonsideof patientsandplaceslegclosesttothemoffedgeoftable.Theexaminertheninstructsthepatientsto activelyflextheoppositelegtotheirchestandhold.Theexaminerthenappliespressuretotheleg handingoffedgeoftableforcingthehipintoextension. SacralThrustTest:Thepatientisproneandtheexaminerappliesananteriorpressurethroughthe sacrum. 2outof4provocationtests(distraction,compression,thighthrustorsacralthrust)havesensitivityof.88 andspecificityof.78.+Likelihoodratio(LR)of4.00and–LRof.16forSIJpathology. 3outofall6provocationhavesensitivityof.94andspecificityof.78.+LRof4.29and–LRof.80forSIJ pathology. LaslettM,AprillCN,McDonaldB,YoungSB.DiagnosisofSacroiliacJointPain:ValidityofIndividualTests andCompositesofTests.ManualTherapy.2005:10;207-18. SIJDysfunctionGoldStandardTesting Thecurrent‘goldstandard’fordiagnosingsacroiliacpathologiesisadiagnosticnerveblock,whereby anaestheticisinsertedintotheSIJ,underfluoroscopyguidance.Someauthorsarguethatifthepatient achieves50-75%painrelief,on2occasionswithshortandlongactingnerveblock,adiagnosisofSIJ dysfunctioncanbemade,butwithcaution(vanderWurffetal2006,Berthelot(citedMaigneetal). FortinFingertest SimplyplaceyourfingerdirectlyontheareaofyourpainwithONEFINGERtwotimes. Accordingtotheresultsofthisstudy,ifyoupointtotheexactspotwherethesacroiliacjointislocated (rightorleft)eachtime,yourpainislikelycomingfromtheSIjoint.Seediagrambelowforlocationof sacroiliacjoints. TheSIjointsarelocatedimmediatelybelowandtotheinsideoftheposteriorsuperioriliacspines(PSIS), whichfeellikesmallboneybumpsoneachsideofyourlowerback.Eithersidecanbepainful StandingFlexiontest Thepatientisinstructedtobendforwardfromastandingpositionandthefeethipwidthapart, attemptingtotouchthefloorwhilethetherapistfollowsthePSIS’stoseewhetheroneappearstomove moretowardsthehead.IfoneofthePSIS’smovestowardstheheadthetestisconsideredpositive.A positivetestissuggestiveofaSIJDonthepositiveside. Storktest TheexaminerplacesonethumbjustbelowthePSISandtheotherthumbonthesacralsulcus.Withthe patientinstandingandarmsunsupported,thepatientisinstructedtoliftthetestedsidekneetowards theceilinguntilhehasreached>90degreesofhipflexion.Ifpositive,thereisastrongindicationofSIJD presentonthatside.Normally,thePSISshouldbegintodropdown(inferiorly)after90degreesofhip flexion.ThistestisconsideredpositiveifthePSISdoesnotmoveormovesupward(superiorly)3. Longsittest Theexaminergraspsthepatient’slegsabovetheanklesandfullyflexesthem,thenextendsthem.The examinerthencomparesthetwomedialmalleolitoseeifadifferenceinpositionispresent.Havethe patientsitup,whilekeepingthelegsextended.Comparethepositionofthemedialmalleoliagaintosee ifthereisachange.Ifthereisaposteriorinnominate,thelegthatappearedshorterwilllengthenwith thesitup(Orwillgofromshorttolong).Ifthereisananteriorinnominate,thelegthatappearedlonger willshortenwiththesitup.(Orgofromlongtoshort).Theaffectedsideislabelbasedonwhichsidethe examinernoticedapositiveseated,standing,and/orstorktest.Thistestcanhelpindifferentiating betweenatrueleglengthdiscrepancyandafunctionalleglengthdiscrepancyduetoasacroiliac dysfunction. Leglengthmeasurement AleglengthmeasurementcanbemadewiththepatientinsupinestartingfromunderneaththeASIS andendingunderneaththemedialmalleolusonthesameside.Anydifferencenotedwillbeatrueleg lengthdiscrepancyandmaybereasontointroduceaheelliftororthotic. Seatedflexiontest Thepatientisseatedwiththefeetontheground,armsbetweentheknees,andthekneesapart.The examinerplaceshisthumbsunderneaththePSIS’sonbothsidesandasksthepatienttobendforwardas faraspossible.Ifonethumbmovesmoretowardstheheadthenthetestispositive.Apositivetestis suggestiveofaSIJDonthatside.3 Pronehipextensiontest Thepatientliesonherstomachandliftsonelegwiththekneestraightabout6inchesoffthetable.The testisrepeatedontheoppositeside.Ifonesideseemsignificantlyhardertodoand/ortherewasa significantdelayinthegluteusmaximuscontractionduringhipextensionthenthissideispositive.A positivetestsuggestsgluteusmaximusunderactivityandmaybemeanthereissamesideSIJDora lumbarfacetproblem. SingleleggedSquattest Thepatientstandsononelegwhiletheotherlegisliftedoffthegroundinfrontofthebodysothatthe hipisflexedtoapproximately45°andthekneeofthenon-stancelegflexedtoapproximately90°.The armsareheldstraightoutinfront,withthehandsclaspedtogether.Fromthisposition,squatdownuntil about60°kneeflexion,andthenreturntothestartposition.Notethelegthatwastested.Iftheknee bucklesinwardthanthetestispositiveforpoorhipstabilizationandweakGluteusmedius. Treatment and Exercises PhysicalTherapyandotherconservativetreatments APhysicalTherapistusesavarietyofmanualtherapytechniques,stretching,exercises,andmodalities toaddressthesourceofapatient’spain;theyalsoworktoalleviatetheaggravatingsymptomsthat inhibitnormaldailyactivities.ThegoalofPhysicalTherapyisnotonlytohelpapatientreturntotheir premorbidstatus,buttohelpincreasepatients’bodyawarenesssothattheywillbecomemore independentinrecognizinghowtheycantreattheirownpainthroughspecifictreatmentstailoredto individualneeds. Dryneedling AnadditionalserviceofferedbyPhysicalTherapistsforthetreatmentofSIjointandbackpain,dry needlingisquicklybecomingago-totreatmentmethod.Withtheuseofaveryfinepointneedle,the therapistwilllocatethepresenceofatriggerpoint,whichisatightlyboundgroupofmusclefibersthat arehypersensitiveandoftencausepain,andinserttheneedleintothatarea.Thisprocessoftencauses instantreliefoftensioninthemusclegroup/joint. Botoxinjections Traditionallythoughtofasatoolforcosmeticprocedures,Botoxtherapycanbeusedtoreducepainin chronicallypainfulmuscles.“Theseinjectionsdecreasethespasmofmusclesthatcontributetoback pain,reducethesympatheticresponsethatisresponsibleforthedeep-seated‘visceral’componentof lowbackpain,andalsohelpreducetheinflammatoryresponseinandaroundthesiteofinjection.” Steroidinjections Inthehumanbody,painandinflammationgohandinhand.Theinflammatoryresponseofthebody, althoughanaturalprocessdesignedforprotectionoftissuesandjoints,canoftenbeextremely debilitating.Acortisoneinjectionisusedtoreduceinflammation(andthuslyreducepain).The medicationtakeseffectrapidly,andishighlyeffectivecomparedtoanoralequivalent. Prolotherapy “Prolotherapyisaninjection-basedcomplementaryandalternativemedicaltherapyforchronic musculoskeletalpain;overseveraltreatmentsessions,afairlysmallvolumeofanirritantorsclerosing solutionisinjectedatsitesonpainfulligamentandtendoninsertionsandinadjacentjointspaceduring severaltreatmentsessions.”11Thistreatmentkickstartsrepairtothedamagedtissue. PRP PlateletrichPlasma(PRP)involvesdrawing20cc’sofblood,spinningthebloodfor15minutesina centrifuge,extracting3-4cc’sofPRP,andinjectingthePRPdirectlyintothesiteofinjuryusing ultrasoundguidedimagery.Apepperedneedlingtechniqueisusedduringtheinjectiontoinvokean inflammatoryresponse.Theplateletshavealotofgrowthfactorinthem,whichcausesstemcellsand othergrowthfactorstocomeintothearea.Eventuallynewcollagenisformedandfillsinthetearinthe tendon.ResearchshowsthatPRPinjectionsarenotasbeneficialascorticosteroidinjectionsinthefirst 12weeksfollowingtheinjection,butPRPinjectionsaremuchmorebeneficialafter12weeks.At2years postinjectionthetendonactuallylooksnormalandshowsnosignsofinjuryonanMRI,whereasthe corticosteroidsshowednolongtermbenefits.ResearchisongoingtoinvestigatetheaffectsofPRPfor DDDandcartilagedefects.TherearecurrentlynostudiesonPRPandSIJD.ThecostofPRPvariesfrom providerbutistypically$500-$1000/shot. Reference-GosensT.PeerboomsJC.VanLaarW.DenOudstenBL.OngoingPositiveEffectsofPRPversus CorticosteriodInjectioninLateralEpicondylitis:Adoubleblindrandomizedcontrolledtrialwith2-year follow-up.AMJSportsMed201139:1200 PelvicClock Directions:Lieonyourbackwithyourkneesbentandyourfeetplacedonthefloor.Imaginethatyou haveaclockonyourstomachwiththefacepointingtowardstheceiling.Rollyourhipsbacktowards12 O’clockandflattenyourbackintothetable.Nowrollyourhipsforwardto6O’clockandarchyour lowerback.Rollyourlefthipdowntowards3O’clockandthenyourrighthipdowntowards9 o’clock.Tofinishrollyourhipsaroundclockwiseuntilyou’vereachedeverynumberontheclock. Evaluation:Rolltoeachindividualnumberontheclockanddecideinwhicharea(s)youaremost restrictedand/orhavepain.Whenyoufindthenumber(s)intheclockthatarerestrictedfollowthe treatmentguidelinesdescribedonthehandoutforeachnumberthatyouarehavingproblems with.Alternatively,youcanholdyourpelvis6hoursacrossor180degreesacrossfromthenumber(s)in theclockthatarerestrictedorpainfulfor1-2minutes. Reassessment:Repeatthedirectionsabovetoseeifyouhaveclearedtherestrictedareas.Youmay needtorepeattheexercisesagaintogetthebestresults.Youcanperformthepelvicclockexerciseas manytimesadayasnecessary. Thepelvicclockcanbeperformedinsitting. Thenpelviccllockcanbeperformedinstanding. References “Nutation/CounterNutation–YogaAnatomy.”YogaAnatomymadesimple-Information,articles, workshops,andDVDs.N.p.,n.d.Web.12Aug.2013. <http://www.yoganatomy.com/2011/01/nutationcounter-nutation/>. “SIJointPain.”MedicineNet.N.p.,n.d.Web.10Aug.2013.<www.medicinenet.com/sacroiliac_joint_p 3,5Issacs,EdwardR.,andMarkR.Bookhout.Bourdillion’sSpinalManipulation.unknown:ButterworthHeinemann,2002.Print. Greenman,Ph.E..Principlesofmanualmedicine.2nded.Baltimore:Williams&Wilkins,1996.Print. 6“We’veHeardSoMuchofthe‘CORE’,WhatAboutthe‘SLINGS’?«MusculoskeletalConsumer Review.“Physiotherapy|Back,Neck,ShoulderandKneePainSpecialists.N.p.,n.d.Web.12Aug.2013. <http://www.coreconcepts.com.sg/mcr/weve-heard-so-much-of-the-core-what-about-the-slings/>. 7“Re-ThinkingFunctionalMovement:TheSlingSystemsoftheBody| BreakingMuscle.”BreakingMuscle.N.p.,n.d.Web.12Aug.2013. <http://breakingmuscle.com/strength-conditioning/re-thinking-functional-movement-sling-systemsbody>. Jemmett,Rick.Spinalstabilization:thenewscienceofbackpain.2nded.Halifax,N.S.:NovontHealth Pub.,2003.Print. “InternalObliqueMuscle|Actions|Attachments|Origin&Insertion.”GetBodySmart:Interactive TutorialsandQuizzesOnHumanAnatomyandPhysiology.N.p.,n.d.Web.12Aug.2013. <http://www.getbodysmart.com/ap/muscularsystem/abdominalmuscles/internaloblique/tutorial.html> . Reed,StephenCharles,PennyReed,andMichaelH.Ford.Thecompletedoctor’shealthybackbible:a practicalmanualforunderstanding,preventingandtreatingbackpain.Toronto:R.Rose,2004.Print. “Prolotherapyinprimarycarepractice.[PrimCare.2010]–PubMed–NCBI.”NationalCenterfor BiotechnologyInformation.N.p.,n.d.Web.12Aug.2013. <http://www.ncbi.nlm.nih.gov/pubmed/20188998>. FortinJD,FalcoFJ.,AmJOrthop(BelleMeadNJ).1997Jul;26(7):477-80.TheFortinfingertest:an indicatorofsacroiliacpain.TempleUniversityMedicalSchool,Philadelphia,Pennsylvania,USA. ThePelvicGirdle:Anintegrationofclinicalexpertiseandresearch,4ebyDianeG.LeeBSRFCAMPT CGIMS(Nov23,2010) CrossleyKM,ZhangWJ,SchacheAG,BryantA,CowanSM.Performanceonthesingle-legsquattask indicateshipabductormusclefunction.AmJSportsMed.2011Apr;39(4):866-73.Epub2011Feb18 Johnson,Donald(DonaldHugh)Practicalorthopaedicsportsmedicine&arthroscopy/DonaldH. Johnson,RobertAPedowitz.p.;cm.ISBN-13:978-0-7817-5812-3